My 0-555 model has a U exit. This replacement board has a flat connector while the original had a U-shaped connector. It doesn't seem to fit the 0-555 model, or doesn't quite match it. It doesn't seem to produce as much ozone as the original record. You can tell when ozone is being generated by looking through the grille at the plate while the unit is running; The disk should turn purple if it is working properly. This replacement works for a while, and at other times the power seems to go to waste. This product is ok which is why I'm giving it a 3 star rating. I am attaching a picture of the original U fork plate for 0-555.
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